4.9-stable review patch. If anyone has any objections, please let me know.
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From: Florian Westphal fw@strlen.de
commit 6613b6173dee098997229caf1f3b961c49da75e6 upstream.
When first DCCP packet is SYNC or SYNCACK, we insert a new conntrack that has an un-initialized timeout value, i.e. such entry could be reaped at any time.
Mark them as INVALID and only ignore SYNC/SYNCACK when connection had an old state.
Reported-by: syzbot+6f18401420df260e37ed@syzkaller.appspotmail.com Signed-off-by: Florian Westphal fw@strlen.de Signed-off-by: Pablo Neira Ayuso pablo@netfilter.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- net/netfilter/nf_conntrack_proto_dccp.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-)
--- a/net/netfilter/nf_conntrack_proto_dccp.c +++ b/net/netfilter/nf_conntrack_proto_dccp.c @@ -244,14 +244,14 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][D * We currently ignore Sync packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ - sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, + sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, [DCCP_PKT_SYNCACK] = { /* * We currently ignore SyncAck packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ - sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, + sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, }, [CT_DCCP_ROLE_SERVER] = { @@ -372,14 +372,14 @@ dccp_state_table[CT_DCCP_ROLE_MAX + 1][D * We currently ignore Sync packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ - sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, + sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, [DCCP_PKT_SYNCACK] = { /* * We currently ignore SyncAck packets * * sNO, sRQ, sRS, sPO, sOP, sCR, sCG, sTW */ - sIG, sIG, sIG, sIG, sIG, sIG, sIG, sIG, + sIV, sIG, sIG, sIG, sIG, sIG, sIG, sIG, }, }, };